Tom, try ________ much noise while you are eating noodles here in Japan. It’s good manners.

It is difficult to ________ what the long-term effects of the accident will be.[ ]

I ran across David while walking along the street yesterdayI ________ him for three years

There is ______ "f" and______"u" in the word "four".

They agreed to rent the house ______ the roof should be repaired